Upright Shrieker (Hominisaurus sapiens)

Description

Upright shriekers, scientifically known as Hominisaurus sapiens, are theropods that belong to the biological family of great shriekers and are characterized by featherlessness and high intelligence. They have large brains compared to body size, enabling more advanced cognitive skills that facilitate successful adaptation to varied environments, development of sophisticated tools, and formation of complex social structures and civilizations.

Evolution and History

velociraptor Velociraptor mongoliensis, the ancestor of all shriekers, including upright shriekers. It lived 75-63 million years ago, from the Campanian stage of the Cretaceous to the Danian stage of the Paleocene.
Credits to Fred Wierum
Evolutionary history of upright shriekers since the end of Maastrichtian stage of Cretaceous starts from Velociraptor mongoliensis, a small dromaeosaur averaging 2 m long and weighing 20 kg